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0x14: moonshot, BP4: Byte-code for Programmable Protocol-independent PDU Processing
by Jamal Hadi Salim 25 Jan '20

25 Jan '20

Tom Herbert loves moonshots and three-letter acronyms. First it was XDP and now it is BP4. In this talk, Tom will introduce BP4 - a Domain Specific Language for programmable dataplanes based on unifying the best features of eBPF and P4. The goal of BP4 is “write once, run anywhere, run well!” BP4 is intended to run in _both software and hardware_ execution environments. Central to a BP4 program is a dynamically programmable parser that supports a wide variety of protocols and permits support for new protocols to be added on the fly. The BP4 parser semantics include native support for parsing Variable Length Headers (VLH) that contains TLVs, flag-fields, or variable length arrays. Tom will describe the first PoC for BP4 which leverages the eBPF infrastructure. The PoC implements a flow dissector as a BP4 program by essentially replicating the functionality of the current Linux kernel flow_dissector with extra functionality to handle TLV and flag-fields. The programmable flow dissector will then be used as the basis for a dynamic tc-flower classification (which will allow protocols to be programmed and dynamically added for tc-flower processing). More info: https://netdevconf.info/0x14/session.html?talk-BP4-byte-code-for-programmab… Reminder, registration is now open and early bird is still in effect. https://netdevconf.info/0x14/registration.html cheers, jamal

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0x14: 'Tis A TLS Festival folks!
by Jamal Hadi Salim 24 Jan '20

24 Jan '20

TLS aint cheap on the CPU. The trend on Internet traffic is indicating that the majority of internet traffic is being encrypted with TLS. In other words the most common packets are using TLS! For this reason, we need to pay more attention to TLS performance. At 0x14 we have a small TLS festival. And its all about improving performance. In the first talk, Pawel Szymanski and Manasi Deval that assert the claim that you can achive good performance by letting the CPU do its thing. Use modern CPU instructions like X86 AESNI. They run experiments that compare user-mode TLS, Kernel TLS write and kernel TLS Sendfile to contrast various bottlenecks in each one with regards to encryption and authentication, cost of system calls and the memory bandwidth. They will present their results during the talk. The talk will also provide some insight on which of the three approaches is best suited for different type of application scenarios. More info: https://netdevconf.info/0x14/session.html?talk-TLS-performance-characteriza… And in the second TLS talk, Tariq Toukan, Bar Tuaf and Tal Gilboa discuss offloading of TLS to the NIC. They start by reviewing the life cycle of a HW offloaded kTLS connection and the driver-HW interaction in order to support it. They will then present their experiments where NginX TLS activity is offloaded to the Mellanox ConnectX-6Dx NIC (using mlx5e driver). And finally, they present their experimental results which show significant performance speed-up gained by offloading kTLS operations to the HW. More info: https://netdevconf.info/0x14/session.html?talk-kTLS-HW-offload-implementati… In the third talk, Alexander Krizhanovsky and Ivan Koveshnikov continue their quest(see netdev 0x12 talk) to investigate and improve TLS handshake by moving it into the kernel (currently user space handled). In continuation from 0x12, Alexander and Ivan have been experimenting with new kernel approaches to reduce some perf culprits involved in completing a TLS handshake, namely dynamic memory allocation and big integer initialization. They will present their results which quantify the new approach. The talk will cover many other perf topics related to TLS handshake. More info: https://netdevconf.info/0x14/session.html?talk-performance-study-of-kernel-… Reminder, registration is now open and early bird is still in effect. https://netdevconf.info/0x14/registration.html cheers, jamal

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0x14, Registration open!
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

Sorry, resend to fix the hotel link.. We are pleased to announce the opening of registration for Netdev 0x14. Netdev 0x14 conference will be held in downtown Vancouver, Canada March 17-20, 2020 at the Pinnacle Hotel Harbourfront https://www.pinnacleharbourfronthotel.com We took your feedback from 0x13 and made some changes: - the conference is now 4 days (instead of 3). - From day 2 onwards we are going to experiment with breakout rooms. Instead of infinite _great talks_, we are introducing break out sessions. Attendees interested in specific discussions, after a talk or otherwise, can grab an available break out room and have more discussions. We are still deciding on the exact schedule for the break outs. - Having lunch at the location proved very good for the schedule and the collaboration. So we will be feeding you, again. Our main motivation is to bring the community together to the idea-exchange fountain we call Netdev conf. Since this is now a 4 day event - our costs have gone up. We do not aim to make profit from the event; however, to recoup some of the cost we have raised our registration fee. Cost is: CDN $475 for early bird registration which expires on February 17th 11:59PM Eastern time. Starting Feb 17th onwards, the price goes up to CDN $575. Students are 50% off (ID required) More details on registration: https://www.netdevconf.info/0x14/registration.html If you need financial assistance, note that we do provide bursaries (but slightly constrained this time): https://www.netdevconf.info/0x14/bursaries.html If you need a visa to attend and need an invitation letter, please dont procrastinate and contact us at: registrar(a)netdevconf.info more info at: https://www.netdevconf.info/0x14/travel.html cheers, jamal _______________________________________________ people mailing list people(a)netdevconf.org https://lists.netdevconf.info/cgi-bin/mailman/listinfo/people

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0x14, Registration open!
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

We are pleased to announce the opening of registration for Netdev 0x14. Netdev 0x14 conference will be held in downtown Vancouver, Canada March 17-20, 2020 at the Pinnacle Hotel Harbourfront https://pinnacleharbourfronthotel.com We took your feedback from 0x13 and made some changes: - the conference is now 4 days (instead of 3). - From day 2 onwards we are going to experiment with breakout rooms. Instead of infinite _great talks_, we are introducing break out sessions. Attendees interested in specific discussions, after a talk or otherwise, can grab an available break out room and have more discussions. We are still deciding on the exact schedule for the break outs. - Having lunch at the location proved very good for the schedule and the collaboration. So we will be feeding you, again. Our main motivation is to bring the community together to the idea-exchange fountain we call Netdev conf. Since this is now a 4 day event - our costs have gone up. We do not aim to make profit from the event; however, to recoup some of the cost we have raised our registration fee. Cost is: CDN $475 for early bird registration which expires on February 17th 11:59PM Eastern time. Starting Feb 17th onwards, the price goes up to CDN $575. Students are 50% off (ID required) More details on registration: https://www.netdevconf.org/0x14/registration.html If you need financial assistance, note that we do provide bursaries (but slightly constrained this time): https://www.netdevconf.org/0x14/bursaries.html If you need a visa to attend and need an invitation letter, please dont procrastinate and contact us at: registra(a)netdevconf.org more info at: https://www.netdevconf.org/0x14/travel.html cheers, jamal

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0x14: Workshop, Netfilter
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

Pablo Neira Ayuso will chair a netfilter workshop that will cover updates in the Netfilter land since the last NetDev conference such as: * Summary of asorted updates. * Updates on the next generation packet classification framework. * Connection tracking support for bridge. * Hardware offloads. More info: https://netdevconf.info/0x14/session.html?workshop-netfilter cheers, jamal

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0x14: New workshop, Hardware acceleration and offload
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

Tom Herbert will chair a workshop on hardware acceleration and offload in Network Interface Cards. Tentative agenda for the workgroup include the following topics: - New work in checksum and segmentation offloads - TC flower offload - XDP hints - XDP/eBPF offload - Receive packet steering - Netfilter offload - OVS offload - Application specific hardware queues More info: https://netdevconf.info/0x14/session.html?workshop-hardware-acceleration-an… cheers, jamal

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congestion control in the bufferbloated age
by Dave Taht 23 Jan '20

23 Jan '20

I am unsure if I will make netdevconf this year, as increasingly interesting as the agenda seems. Might make it, might not. my talk at linux.conf.au last week was quite droll with lots of funny bits, and perhaps next year y'all might enjoy something like it, instead of something more serious? https://blog.apnic.net/2020/01/22/bufferbloat-may-be-solved-but-its-not-ove… I figure this time next year writing something more serious will be feasible as the l4s vs sce debate will have settled, and I'll plan on that. -- Make Music, Not War Dave Täht CTO, TekLibre, LLC http://www.teklibre.com Tel: 1-831-435-0729

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0x14: Tutorial, How to add AF_XDP zero-copy support to drivers
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

AF_XDP is a relatively new technology optimized for high performance packet processing. It provides an abstraction over hardware rings, so the application can handle packets in a low-level, yet hardware-agnostic fashion. With conforming drivers, AF_XDP also provides zero-copy packet handling capabilities to the application. At its basic level AF_XDP works works fine with a lot of conforming drivers. Adding zero-copy support is more challenging. Maxim Mikityanskiy has been through trial-by-fire writting zero copy AF_XDP support and came out unscathed. In this tutorial, Maxim instructs on how a driver author would go about adding AF_XDP zero copy support using the mlx5e driver as an example. More info: https://netdevconf.info/0x14/session.html?tutorial-adding-AF_XDP-zero-copy-… cheers, jamal

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0x14: nutsnbolts talk, NVMe-over-TCP ≈ NVMe-over-RDMA
by Jamal Hadi Salim 22 Jan '20

22 Jan '20

Networks are getting faster but so is storage. It is not uncommon anymore for a single high performance storage device to deliver as much as a million read/write operations per second. For traditional remote storage accesses CPU requirements have become unsustainable. The recently merged NVMe-over-TCP has improved performance lowering CPU utilization. However, despite of its advantages of being able to use commodity NICs, NVMe-over-TCP's performance is still significantly worse than NVMe-over-RDMA. Rachit Agarwal, Qizhe Cai, and Jaehyun Hwang have some new ideas on how to significantly improve the status quo. They will discuss a design, implementation and evaluation of several new ideas within NVMe-over-TCP. Their design maintains all the desirable properties of NVMe-over-TCP (unmodified applications, unmodified TCP/IP stack, etc.), and yet, saturates a 100Gbps link for remote accesses using CPU utilization _similar to state-of-the-art user-space and RDMA-based solutions_. More information: https://bit.ly/2Ri6hJd cheers, jamal

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0x14: nutsnbolts talk, Hardware Acceleration of Container Networking Interfaces
by Jamal Hadi Salim 22 Jan '20

22 Jan '20

In this talk Amritha Nambiar, Sridhar Samudrala, and Kiran Patil will discuss the current approaches used in offloading of container network interfaces. The talk will cover macvlan, ipvlan and subdevice functions in addition to some of the newly proposed generic interfaces to create virtual interfaces from a parent pci device. Challenges and limitations of the different approaches as well new ideas will be discussed. More information: https://www.netdevconf.info/0x14/session.html?talk-hardware-acceleration-of… cheers, jamal

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